System and method of cleaning condenser for binary power generation

ABSTRACT

A system of cleaning a condenser provided in a circulation flow passage for allowing circulation of a working medium in a binary power generation system, includes: an inlet header into which a cooling medium flows; and a heat exchanger including a plurality of branch ports into which the cooling medium flows from the inlet header. The heat exchanger is configured to perform heat exchange between the working medium and the cooling medium to condense the working medium. The cleaning system includes a switching unit configured to switch a flow of the cooling medium to a direction from the heat exchanger to the inlet header.

BACKGROUND OF THE INVENTION Field of the Invention

The present invention relates to a system of cleaning a condenser forbinary power generation and a method of cleaning the condenser forbinary power generation.

Description of the Related Art

Binary power generation systems configured to generate electric power byusing vapor of a low-boiling working medium such as hydrocarbon orammonia have been recently known. In each of such binary powergeneration systems, a condenser is used to condense the low-boilingworking medium generated after a turbine is rotatably driven. In thecondenser, seawater or river water externally supplied is used as acooling medium to be heat-exchanged with the low-boiling working medium(for example, see Japanese Unexamined Patent Application Publication No.2016-008042).

Here, the condenser includes: an inlet header into which the coolingmedium flows; and a heat exchanger including plural branch ports intowhich the cooling medium flows from the inlet header, and the heatexchanger is configured to perform heat exchange between the workingmedium and the cooling medium to condense the working medium. The forcein the direction of flow of the cooling medium is likely to act on asurface of the inlet header into which the branch ports are opened; inother words, the force in the direction of pressing against the surfaceis likely to act thereon. Therefore, foreign substances tend to beadhered to the periphery of the branch ports in the surface.

In particular, if the seawater or the river water is applied as thecooling medium, marine organisms are possibly included in the coolingmedium. Accordingly, foreign substances such as marine organisms tend tobe adhered to the periphery of the branch ports in the surface.Therefore, a flow passage for the cooling medium in the condenser isblocked with the foreign substances and thus heat exchanging performanceof the condenser may deteriorate. Consequently, the condenser isregularly disassembled and cleaned; however, the work to disassemble andclean the condenser is complicated.

SUMMARY OF THE INVENTION

The present invention is thus made in view of the foregoing problems,and it is an object of the present invention to provide a system ofcleaning a condenser for binary power generation and a method ofcleaning the condenser for binary power generation which enable theremoval of foreign substances adhered to the inside of the condenserwithout disassembling the condenser.

A system of cleaning a condenser for binary power generation accordingto an aspect of the present invention is a system of cleaning acondenser provided in a circulation flow passage for allowingcirculation of a working medium in a binary power generation system. Thecondenser includes: an inlet header into which a cooling medium flows;and a heat exchanger including a plurality of branch ports into whichthe cooling medium flows from the inlet header. The heat exchanger isconfigured to perform heat exchange between the working medium and thecooling medium to condense the working medium. The cleaning systemincludes a switching unit configured to switch a flow of the coolingmedium to a direction from the heat exchanger to the inlet header.

According to this configuration, the cleaning system includes theswitching unit configured to switch the flow of the cooling medium tothe direction from the heat exchanger to the inlet header. Accordingly,the force to separate foreign substances from the branch ports can beapplied by the cooling medium to the foreign substances adhered to theperiphery of the branch ports in a surface of the inlet header intowhich the branch ports are opened. Therefore, the foreign substancesadhered to the periphery of the branch ports are easily separatedtherefrom and thus the foreign substances can be removed withoutdisassembling the condenser.

In the foregoing configuration, the cleaning system may include a firstpipe allowing the cooling medium to flow into the inlet header of thecondenser. The cleaning system may include a second pipe allowing thecooling medium to flow out of the condenser. The cleaning system mayinclude a third pipe adapted to connect the first pipe to the secondpipe. The cleaning system may include a fourth pipe adapted to connect asecond portion of the first pipe to a fourth portion of the second pipe.The second portion of the first pipe is located downward, in a flowdirection of the cooling medium, of a first portion of the first pipe towhich the third pipe is connected. The fourth portion of the second pipeis located downstream, in the flow direction of the cooling medium, of athird portion of the second pipe to which the third pipe is connected.The switching unit may switch from a first state where the coolingmedium flows from the first pipe into the condenser to a second statewhere the cooling medium flows from the first pipe through the thirdpipe and the second pipe into the condenser.

According to this configuration, the switching unit switches from thefirst state where the cooling medium flows from the first pipe into thecondenser to the second state where the cooling medium flows from thefirst pipe through the third pipe and the second pipe into thecondenser. Therefore, the flow of the cooling medium can be switched tothe direction from the heat exchanger to the inlet header by the simpleconfiguration.

In the foregoing configuration, the cleaning system may include astrainer provided in the fourth pipe and configured to remove foreignsubstances in the cooling medium from the cooling medium.

According to this configuration, the foreign substances separated fromthe periphery of the branch ports are caught by the strainer; therefore,the foreign substances are further easily removed.

In the foregoing configuration, the cleaning system may include a firstpressure meter provided in the first pipe and configured to measure apressure of the cooling medium flowing from the first pipe to thecondenser. The cleaning system may include a second pressure meterprovided in the second pipe and configured to measure a pressure of thecooling medium flowing out of the condenser.

According to this configuration, an operator can recognize on the basisof a pressure difference between a pressure value measured by the firstpressure meter and a pressure value measured by the second pressuremeter whether the flow passage for the cooling medium in the condenseris blocked. This is because as the flow passage for the cooling mediumin the condenser is gradually blocked, the pressure of the coolingmedium at an inlet side in the condenser increases and the pressure ofthe cooling medium at an outlet side in the condenser decreases.

In the foregoing configuration, the cleaning system may include acontrol unit configured to, when a pressure difference between apressure value measured by the first pressure meter and a pressure valuemeasured by the second pressure meter has exceeded a predeterminedvalue, control the switching unit to establish the second state.

According to this configuration, when a pressure difference between apressure value measured by the first pressure meter and a pressure valuemeasured by the second pressure meter has exceeded the predeterminedvalue, the second state is automatically established by the controlunit. Therefore, an operator does not need to perform switchingoperation to the second state.

In the foregoing configuration, the control unit may be configured to,when a pressure difference between a pressure value measured by thefirst pressure meter and a pressure value measured by the secondpressure meter has reached a value smaller than or equal to thepredetermined value, control the switching unit to establish the firststate.

According to this configuration, when a pressure difference between apressure value measured by the first pressure meter and a pressure valuemeasured by the second pressure meter has reached a value smaller thanor equal to the predetermined value, the first state is automaticallyestablished by the control unit. Therefore, an operator does not need toperform switching operation to the first state.

In the foregoing configuration, the cleaning system may include: a firstthermometer provided in the first pipe and configured to measure atemperature of the cooling medium flowing from the first pipe into thecondenser; and a second thermometer provided in the second pipe andconfigured to measure a temperature of the cooling medium flowing out ofthe condenser.

According to this configuration, an operator can recognize on the basisof a temperature difference between a temperature measured by the firstthermometer and a temperature measure by the second thermometer whetherthe flow passage for the cooling medium in the condenser is blocked.This is because as the flow passage for the cooling medium in thecondenser is gradually blocked, the flow rate of the cooling mediumdecreases and the temperature of the cooling medium at the outlet sideof the condenser increases.

In the foregoing configuration, the cleaning system may include acontrol unit configured to, when a temperature difference between atemperature measured by the first thermometer and a temperature measuredby the second thermometer has exceeded a predetermined value, controlthe switching unit to establish the second state.

According to this configuration, when a temperature difference between atemperature measured by the first thermometer and a temperature measuredby the second thermometer has exceeded the predetermined value, thesecond state is automatically established by the control unit.Therefore, an operator does not need to perform switching operation tothe second state.

In the foregoing configuration, the control unit may configured to, whena temperature difference between a temperature measured by the firstthermometer and a temperature measured by the second thermometer hasreached a value smaller than or equal to the predetermined value,control the switching unit to establish the first state.

According to this configuration, when a temperature difference between atemperature measured by the first thermometer and a temperature measuredby the second thermometer has reached a value smaller than or equal tothe predetermined value, the flow of the cooling medium is automaticallyswitched to the first state by the control unit. Therefore, an operatordoes not need to perform switching operation to the first state.

A method of cleaning a condenser for binary power generation accordingto another aspect of the present invention is a method of cleaning acondenser provided in a circulation flow passage for allowingcirculation of a working medium in a binary power generation system. Thecondenser includes: an inlet header into which a cooling medium flows;and a heat exchanger including a plurality of branch ports into whichthe cooling medium flows from the inlet header. The heat exchanger isconfigured to perform heat exchange between the working medium and thecooling medium and condense the working medium. The cleaning methodincludes the step of switching a flow of the cooling medium to adirection from the heat exchanger to the inlet header.

According to this configuration, the cleaning method includes the stepof switching the flow of the cooling medium to the direction from theheat exchanger to the inlet header. Therefore, the force to separateforeign substances from the branch ports can be applied by the switchingstep to the foreign substances adhered to the periphery of the branchports. Therefore, the foreign substances adhered to the periphery of thebranch ports are easily separated therefrom and thus the foreignsubstances can be removed without disassembling the condenser.

In the foregoing configuration, the method may include a first branchedpipe branched from a first pipe for allowing the cooling medium to flowinto the inlet header of the condenser, and the first branched pipe mayinclude a first joint at an end thereof. The method may include a secondbranched pipe branched from a second pipe for allowing the cooing mediumto flow out of the condenser, and the second branched pipe may include asecond joint at an end thereof. The method may include a third branchedpipe branched from a second portion of the first pipe, which is locateddownstream, in a flow direction of the cooling medium, of a firstportion of the first pipe from which the first branched pipe isbranched, and the third branched pipe may include a third joint at anend thereof. The method may include a fourth branched pipe branched froma fourth portion of the second pipe, which is located downstream, in theflow direction of the cooling medium, of a third portion of the secondpipe from which the second branched pipe is branched, and the fourthbranched pipe may include a fourth joint at an end thereof. The methodmay include a switching unit configured to stop the flow of the coolingmedium between the first portion and the second portion of the firstpipe and to stop the flow of the cooling medium between the thirdportion and the fourth portion of the second pipe. The method mayinclude: a first step of connecting the first branched pipe through thethird pipe to the second branched pipe via the first joint and via thesecond joint; a second step of connecting the third branched pipethrough the fourth pipe to the fourth branched pipe via the third jointand via the fourth joint; and a third step of switching by the switchingunit from a first state where the cooling medium flows from the firstpipe into the condenser to a second state where the cooling medium flowsfrom the first pipe through the third pipe and the second pipe into thecondenser.

According to this configuration, the first to third steps are performed;thereby, the flow of the cooling medium can be switched to the directionfrom the heat exchanger to the inlet header. Therefore, the force toseparate foreign substances from the branch ports can be applied to theforeign substances adhered to the periphery of the branch ports.Therefore, the foreign substances adhered to the periphery of the branchports are easily separated therefrom and thus the foreign substances canbe removed without disassembling the condenser.

According to the present invention, a system of cleaning a condenser forbinary power generation includes a switching unit configured to switch aflow direction of a cooling medium flowing in a condenser to an oppositedirection to the flow direction. Accordingly, the flow direction of thecooling medium is switched to the opposite direction; thereby, the forceto separate foreign substances from branch ports can be applied to theforeign substances adhered to the periphery of the branch ports.Therefore, the foreign substances adhered to the periphery of the branchports are easily separated therefrom and thus the foreign substances canbe removed without disassembling the condenser.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a schematic configuration diagram showing a binary powergeneration system in which a system of cleaning a condenser for binarypower generation according to a first embodiment is used.

FIG. 2 is a schematic configuration diagram showing the condenserapplied in the system of cleaning the condenser for binary powergeneration according to the first embodiment.

FIG. 3 is a schematic configuration diagram showing the system ofcleaning the condenser for binary power generation during normaloperation according to the first embodiment.

FIG. 4 is a schematic configuration diagram showing the system ofcleaning the condenser for binary power generation during cleaning ofthe condenser according to the first embodiment.

FIG. 5 is a schematic configuration diagram showing a system of cleaningthe condenser for binary power generation during normal operationaccording to a second embodiment.

FIG. 6 is a schematic configuration diagram showing the system ofcleaning the condenser for binary power generation during cleaning ofthe condenser according to the second embodiment.

FIG. 7 is a diagram illustrating the control operation of a control unitin the system of cleaning the condenser for binary power generationaccording to the second embodiment.

FIG. 8 is a schematic configuration diagram showing a system of cleaningthe condenser for binary power generation during normal operationaccording to a third embodiment.

FIG. 9 is a schematic configuration diagram showing the system ofcleaning the condenser for binary power generation during cleaning ofthe condenser according to the third embodiment.

FIG. 10 is a diagram illustrating the control operation of a controlunit in the system of cleaning the condenser for binary power generationaccording to the third embodiment.

FIG. 11 is a schematic configuration diagram showing a system ofcleaning the condenser for binary power generation during normaloperation of the condenser according to a fourth embodiment.

FIG. 12 is a schematic configuration diagram showing a system ofcleaning the condenser for binary power generation during cleaning ofthe condenser according to the fourth embodiment.

FIG. 13 is a schematic configuration diagram showing a method ofcleaning the condenser for binary power generation during normaloperation of the condenser according to a fifth embodiment.

FIG. 14 is a schematic configuration diagram showing the method ofcleaning the condenser for binary power generation during cleaning ofthe condenser according to the fifth embodiment.

DESCRIPTION OF THE PREFERRED EMBODIMENTS

Hereinafter, embodiments of the present invention will be described withreference to the drawings. For the purpose of illustration, each of thedrawings simply shows major components to be required for describing asystem of cleaning a condenser for binary power generation according toeach of the embodiments of the present invention. Accordingly, thesystem of cleaning the condenser for binary power generation accordingto each embodiment of the present invention can include any componentsthat are not shown in the drawings referred to as by the specification.

First Embodiment

FIG. 1 is a schematic configuration diagram illustrating a binary powergeneration system 1 in which a system of cleaning a condenser for binarypower generation is used. The binary power generation system 1 is apower generation system utilizing a Rankine cycle. The binary powergeneration system 1 includes a condenser 6, a circulation pump 8, aheater 10, and an expander 14. The condenser 6, the circulation pump 8,the heater 10, and the expander 14 are provided in a circulation flowpassage 4 in the mentioned order. A circulation circuit is configured inthe binary power generation system 1 such that a working medium flowsthrough the circulation flow passage 4 via the heater 10, the expander14, the condenser 6 and the circulation pump 8 in the mentioned order. Acooling medium having a boiling point lower than the boiling point ofwater is applied as the working medium.

The circulation pump 8 is provided downstream of the condenser 6(between the heater 10 and the condenser 6) in the circulation flowpassage 4. The circulation pump 8 serves to circulate the working mediumin the circulation flow passage 4. The circulation pump 8 pressurizesthe liquid working medium condensed in the condenser 6 to apredetermined pressure and thereafter pumps the working medium to theheater 10. For example, a centrifugal pump provided with an impeller asa rotor or a gear pump including a rotor formed by a pair of gears isapplied as the circulation pump 8. The circulation pump 8 is controlledto be driven by a controller 30. The function of the controller 30includes a pump control unit 30 a. The pump control unit 30 a isconfigured to control the number of rotations of the circulation pump 8.The pump control unit 30 a controls the circulation pump 8 to be drivenso that the degree of superheat of the working medium may fall within apreliminarily-established range. Also, the pump control unit 30 acontrols the circulation pump 8 to start and stop.

The heater 10 is provided downstream of the circulation pump 8 (betweenthe circulation pump 8 and the expander 14) in the circulation flowpassage 4. The heater 10 includes a working medium flow passage 10 athrough which the working medium flows and a heat source medium flowpassage 10 b through which a heat source medium flows. The heat sourcemedium flow passage 10 b is connected to a heat source medium circuit72. The heat source medium supplied from an external heat source flowsthrough the heat source medium flow passage 10 b. The working mediumflowing through the working medium flow passage 10 a is heat-exchangedwith the heat source medium flowing through the heat source medium flowpassage 10 b to evaporate. The heat source medium may include, forexample, hot water, water vapor, or the like.

A generator 16 is connected to the expander 14. A gaseous working mediumis expanded in the expander 14; thereby, the power to drive thegenerator 16 can be derived.

FIG. 2 is a schematic configuration diagram illustrating the condenser 6applied in a system X1 of cleaning the condenser 6 for binary powergeneration. The condenser 6 serves to condense the gaseous workingmedium discharged from the expander 14 to generate the liquid workingmedium. The condenser 6 includes: a heat exchanger 6 a configured toconduct heat exchange between the working medium and a cooling mediumand condense the working medium; an inlet header 6 b for allowing inflowof the cooling medium into the heat exchanger 6 a; and an outlet header6 c for allowing outflow of the cooling medium that has flowed throughthe heat exchanger 6 a. As long as the condenser 6 is provided with aninlet header to which after-mentioned plural branch ports of the heatexchanger 6 a are opened, any of a plate condenser, a shell-and-tubecondenser, and a fin-and-tube condenser can be used as the condenser 6.

The heat exchanger 6 a is formed such that working medium flow passagesS1 through each of which the gaseous working medium flows and coolingmedium flow passages S2 through each of which the cooling medium flowsare arranged alternately side by side with each other in an up to downdirection. The flow direction of the working medium is different by 90degrees from the flow direction of the cooling medium. The heatexchanger 6 a includes: plural branch ports 11 for allowing inflow ofthe cooling medium from the inlet header 6 b; and plural joint ports 12for allowing outflow of the cooling medium to the outlet header 6 c.

The inlet header 6 b is formed to be elongated in a directionperpendicular to the flow direction of the cooling medium. An inflowport 17 for the cooling medium is formed in a surface 13 of the inletheader 6 b, which is located upstream in the flow direction of thecooling medium. A first pipe 18 for allowing the cooling medium from asupply source of the cooling medium into the inlet header 6 b isconnected to the inflow port 17. The supply source (not shown) of thecooling medium may include, for example, seawater or river water. Theplural branch ports 11 are provided at intervals and opened to a surface19 of the inlet header 6 b, which is located downstream in the flowdirection of the cooling medium.

The outlet header 6 c is formed to be elongated in a directionperpendicular to the flow direction of the cooling medium. The pluraljoint ports 12 are opened to a surface 20 of the outlet header 6 c,which is located upstream in the flow direction of the cooling medium.An outflow port 22 for the cooling medium is formed in a surface 21 ofthe outlet header 6 c, which is located downstream in the flow directionof the cooling medium. A second pipe 23 for allowing the cooling mediumto flow out from the outlet header 6 c into the supply source of thecooling medium is connected to the outflow port 22.

Here, the operation of the binary power generation system 1 will bedescribed. When the circulation pump 8 is driven, the liquid workingmedium pumped from the circulation pump 8 flows into the working mediumflow passage 10 a of the heater 10. The working medium is heated by theheat source medium flowing through the heat source medium flow passage10 b, therefore evaporating. The working medium evaporated in the heater10 is supplied into the expander 14. The working medium is supplied intothe expander 14 and thereby the expander 14 is rotatably driven. As aresult, the generator 16 is driven to generate electric power. Theworking medium expanded in the expander 14 is discharged into thecirculation flow passage 4. The gaseous working medium discharged fromthe expander 14 is supplied into the working medium flow passages S1 ofthe condenser 6. In the condenser 6, the working medium is cooled by thecooling medium flowing through the cooling medium flow passages S2 to becondensed to the liquid working medium. The liquid working medium flowsthrough the circulation flow passage 4 to be suctioned into thecirculation pump 8. In the circulation flow passage 4, such circulationis repeated and thereby electric power is generated in the generator 16.

FIG. 3 is a schematic configuration diagram illustrating the system X1of cleaning the condenser 6 for binary power generation during normaloperation. The system X1 of cleaning the condenser 6 for binary powergeneration includes a third pipe 24 and a fourth pipe 25. The third pipe24 establishes a connection between the first pipe 18 and the secondpipe 23. The fourth pipe 25 establishes a connection between a secondportion P2 of the first pipe 18 and a fourth portion P4 of the secondpipe 23. The second portion P2 is located downstream, in the flowdirection of the cooling medium, of a first portion P1 of the first pipe18 to which the third pipe 24 is connected. The fourth portion P4 islocated downstream, in the flow direction of the cooling medium, of athird portion P3 of the second pipe 23 to which the third pipe 24 isconnected. The system X1 of cleaning the condenser 6 for binary powergeneration further includes: a switching unit 26 configured to switchthe flow of the cooling medium to a direction from the heat exchanger 6a to the inlet header 6 b; and a strainer 27 configured to removeforeign substances in the cooling medium from the cooling medium.

The switching unit 26 includes a first on-off valve 26 a interposedbetween the first portion P1 and the second portion P2 of the first pipe18, a second on-off valve 26 b interposed between the third portion P3and the fourth portion P4 of the second pipe 23, a third on-off valve 26c provided in the third pipe 24, and a fourth on-off valve 26 d providedin the fourth pipe 25. The switching unit 26 can switch from a firststate where the cooling medium flows from the first pipe 18 into thecondenser 6 to a second state where the cooling medium flows from thefirst pipe 18 through the third pipe 24 and the second pipe 23 into thecondenser 6. Specifically, the switching unit 26 opens the first on-offvalve 26 a and the second on-off valve 26 b and closes the third on-offvalve 26 c and the fourth on-off valve 26 d, thereby establishing thefirst state. The switching unit 26 closes the first on-off valve 26 aand the second on-off valve 26 b and opens the third on-off valve 26 cand the fourth on-off valve 26 d, thereby establishing the second state.Manual valves that can manually open and close flow passages of fluidmay be applied as the first to fourth on-off valves 26 a to 26 d.

The system X1 of cleaning the condenser 6 for binary power generationaccording to the first embodiment operates as follows. In order to bringthe flow of the cooling medium into the first state during normaloperation, the first on-off valve 26 a and the second on-off valve 26 bare opened by an operator and the third on-off valve 26 c and the fourthon-off valve 26 d are closed by the operator. Thus, the flow of thecooling medium is brought into the first state where the cooling mediumflows from the first pipe 18 into the condenser 6 and then flows outinto the second pipe 23.

Here, as show in FIG. 2, the force in the flow direction of the coolingmedium, i.e. the force in a direction in which foreign substances FS arepushed against the surface 19 is likely to act on the surface 19 of theinlet header 6 b, which is located downstream in the flow direction ofthe cooling medium. Therefore, the foreign substances FS are easilyadhered to the surface 19 of the inlet header 6 b, which is locateddownstream in the flow direction of the cooling medium.

FIG. 4 is a schematic configuration diagram illustrating the system X1of cleaning the condenser 6 for binary power generation during cleaningof the condenser 6. When a predetermined time has elapsed during normaloperation, in order to bring the flow of the cooling medium into thesecond state, the first on-off valve 26 a and the second on-off valve 26b are closed by an operator and the third on-off valve 26 c and thefourth on-off valve 26 d are opened by the operator. Thus, the coolingmedium flows from the first pipe 18 through the third pipe 24 and thesecond pipe 23 into the condenser 6 and then flows out to the first pipe18. The cooling medium flows out to the first pipe 18, thereafterflowing through the fourth pipe 25 to the second pipe 23.

At this time, the cooling medium in the condenser 6 flows in thedirection from the heat exchanger 6 a to the inlet header 6 b, as shownin FIG. 2. Accordingly, the force in such a direction to separate theforeign substances FS from the branch ports 11 acts on the foreignsubstances FS adhered to the periphery of the branch ports 11 in thesurface 19 of the inlet header 6 b, which is located downstream in theflow direction of the cooling medium. Therefore, the foreign substancesFS adhered to the periphery of the branch ports 11 in the surface 19 ofthe inlet header 6 b, which is located downstream in the flow directionof the cooling medium easily separate from the periphery of the branchports 11. Consequently, the foreign substances FS can be removed withoutdisassembling the condenser 6.

The foreign substances FS separated from the periphery of the branchports 11 are discharged together with the cooling medium into the firstpipe 18, thereafter flowing through the fourth pipe 25. At this time,the foreign substances FS in the cooling medium are removed from thecooling medium by the strainer 27. Therefore, the foreign substances FSare easily removed.

Second Embodiment

Next, a cleaning system X2 for the condenser 6 for binary powergeneration according to a second embodiment will be described withreference to FIG. 5 and FIG. 6. In the second embodiment, onlydifferences from the first embodiment will be described, and the sameconfigurations as those of the first embodiment will be assigned withthe same reference numbers and thus will not be described.

FIG. 5 is a schematic configuration diagram illustrating the system X2of cleaning the condenser 6 for binary power generation during normaloperation. FIG. 6 is a schematic configuration diagram illustrating thesystem X2 of cleaning the condenser 6 for binary power generation duringcleaning of the condenser 6. The system X2 of cleaning the condenser 6for binary power generation according to the second embodiment includesa first pressure meter 31, a second pressure meter 32, a switching unit33, and a control unit 34. The switching unit 33 of the secondembodiment is different from that of the first embodiment where manualvalves for manually opening and closing flow passages of fluid are usedin that automatic valves for opening and closing flow passages of fluidon the basis of an electric signal are used. Other configurations of theswitching unit 33 of the second embodiment are similar to theconfigurations of the first embodiment.

The first pressure meter 31 includes a first pressure sensor (not shown)for measuring the pressure of the cooling medium flowing from the firstpipe 18 into the condenser 6. The first pressure meter 31 is provided inthe first pipe 18. The second pressure meter 32 includes a secondpressure sensor (not shown) for measuring the pressure of the coolingmedium flowing out of the condenser 6. The second pressure meter 32 isprovided in the second pipe 23. Pressure values measured by the firstpressure sensor and the second pressure sensor are output therefrom aselectric signals to the control unit 34.

When a pressure difference between a pressure value measured by thefirst pressure meter 31 and a pressure value measured by the secondpressure meter 32 has exceeded a predetermined value, the control unit34 controls the switching unit 33 to switch so that the flow of thecooling medium is brought into the second state. Further, when apressure difference between a pressure value measured by the firstpressure meter 31 and a pressure value measured by the second pressuremeter 32 has reached a value smaller than or equal to the predeterminedvalue, the control unit 34 controls the switching unit 33 to switch sothat the flow of the cooling medium is brought into the first state. Thepredetermined value can be set accordingly in consideration of, forexample, the pressure of a pump for pumping the cooling medium and apressure loss and on the basis of a pressure difference assumed when theflow passage for the cooling medium in the condenser 6 is actuallyblocked. For example, the predetermined value can be set to a pressuredifference generated when a pressure value measured by the secondpressure meter 32 has been half a pressure value measured by the firstpressure meter 31.

FIG. 7 is a diagram illustrating the control operation of the controlunit 34 in the system X2 of cleaning the condenser 6 for binary powergeneration. The control unit 34 receives electric signals from the firstpressure sensor and the second pressure sensor (step ST1). The controlunit 34 receives the electric signals in step ST1 and thereaftersubtracts a pressure value measured by the second pressure sensor from apressure value measured by the first pressure sensor; thereby computinga pressure difference (step ST2). The control unit 34 computes thepressure difference and thereafter determines whether the pressuredifference is smaller than or equal to the predetermined value. When thecontrol unit 34 has determined that the pressure difference is smallerthan or equal to the predetermined value (Yes in step ST3), theprocessing goes to step ST4. On the other hand, when the control unit 34has determined that the pressure difference is larger than thepredetermined value (No in step ST3), the processing goes to step ST6.

In step ST4, the control unit 34 determines whether the flow of thecooling medium is presently in the first state. When the control unit 34has determined that the flow of the cooling medium is presently in thefirst state (Yes in step ST4), the processing returns to step ST1. Onthe other hand, when the control unit 34 has determined that the flow ofthe cooling medium is presently in the second state (No in step ST4),the processing goes to step ST5. In step ST5, the control unit 34 sendsto the first to fourth on-off valves 26 a to 26 d control signals forswitching the flow of the cooling medium to the first state (step ST5).In other words, the control unit 34 sends to the first on-off valve 26 aand the second on-off valve 26 b the control signals for opening theflow passage for the cooling medium and sends to the third on-off valve26 c and the fourth on-off valve 26 d the control signals for closingthe flow passage for the cooling medium. Accordingly, the flow passagefor the cooling medium is opened by the first on-off valve 26 a and thesecond on-off valve 26 b and the flow passage for the cooling medium isclosed by the third on-off valve 26 c and the fourth on-off valve 26 d.Thus, the flow of the cooling medium is switched from the second stateto the first state. When the flow of the cooling medium has beenswitched from the second state to the first state, the control unit 34returns the processing to step ST1 (step ST5).

In step ST6, the control unit 34 determines whether the flow of thecooling medium is presently in the second state. When the control unit34 has determined that the flow of the cooling medium is presently inthe second state (Yes in step ST6), the processing returns to step ST1.On the other hand, when the control unit 34 has determined that the flowof the cooling medium is presently in the first state (No in step ST6),the processing goes to step ST7. In step ST7, the control unit 34 sendsto the first to fourth on-off valves 26 a to 26 d control signals forswitching the flow of the cooling medium to the second state (step ST7).In other words, the control unit 34 sends to the first on-off valve 26 aand the second on-off valve 26 b the control signals for closing theflow passage for the cooling medium and sends to the third on-off valve26 c and the fourth on-off valve 26 d the control signals for openingthe flow passage for the cooling medium. Accordingly, the flow passagefor the cooling medium is closed by the first on-off valve 26 a and thesecond on-off valve 26 b and the flow passage for the cooling medium isopened by the third on-off valve 26 c and the fourth on-off valve 26 d.Thus, the flow of the cooling medium is switched from the first state tothe second state. When the flow of the cooling medium has been switchedfrom the first state to the second state, the control unit 34 returnsthe processing to step ST1 (step ST7). The control unit 34 repeats theprocessing of steps ST1 to ST7 until a power supply of the system X2 ofcleaning the condenser 6 for binary power generation according to thesecond embedment is turned off

If the flow passage for the cooling medium in the condenser 6 isblocked, the system X2 of cleaning the condenser 6 for binary powergeneration according to the second embodiment is automatically switchedto the second state where the cooling medium flows from the first pipe18 through the third pipe 24 and the second pipe 23 into the condenser6. Therefore, foreign substances FS adhered to the periphery of thebranch ports 11 are automatically separated. Consequently, the foreignsubstances FS can be removed without disassembling the condenser 6.

When a pressure difference between a pressure value measured by thefirst pressure meter 31 and a pressure value measured by the secondpressure meter 32 has reached a value smaller than or equal to thepredetermined value, the system X2 of cleaning the condenser 6 forbinary power generation according to the second embodiment isautomatically switched to the first state where the cooling medium flowsfrom the first pipe 18 via the condenser 6 to the second pipe 23.Therefore, when the blocking of the flow passage for the cooling mediumin the condenser 6 is solved, an operator does not need to perform theswitching operation to the first state.

The system X2 of cleaning the condenser 6 for binary power generationaccording to the second embodiment includes the control unit 34.Alternatively, the cleaning system X2 may not include the control unit34. In this case, an operator determines on the basis of a pressuredifference between a pressure value measured by the first pressure meter31 and a pressure value measured by the second pressure meter 32 whetherthe flow passage for the cooling medium in the condenser 6 is blocked.If the operator has determined that the flow passage for the coolingmedium in the condenser 6 is blocked, the operator manually performs theswitching operation of the first to fourth on-off valves 26 a to 26 d sothat the flow of the cooling medium is brought into the second state.Likewise, if the operator has determined on the basis of the pressuredifference that the blocking of the flow passage for the cooling mediumin the condenser 6 is solved, the operator manually performs theswitching operation of the first to fourth on-off valves 26 a to 26 d sothat the flow of the cooling medium is brought into the first state. Inthis case, manual valves are applied as the first to fourth on-offvalves 26 a to 26 d.

The control unit 34 controls to switch between the first state and thesecond state on the basis of the pressure difference. Alternatively, thecontrol unit 34 may control to switch between the first state and thesecond state on the basis of a pressure ratio.

Third Embodiment

FIG. 8 is a schematic configuration diagram illustrating a system X3 ofcleaning the condenser 6 for binary power generation during normaloperation. FIG. 9 is a schematic configuration diagram illustrating thesystem X3 of cleaning the condenser 6 for binary power generation duringcleaning of the condenser 6. The system X3 of cleaning the condenser 6for binary power generation according to the third embodiment includes,in place of the first pressure meter 31 and the second pressure meter 32of the second embodiment, a first thermometer 41 for measuring thetemperature of the cooling medium flowing from the first pipe 18 intothe condenser 6 and a second thermometer 42 for measuring thetemperature of the cooling medium flowing out of the condenser 6. Thesystem X3 of cleaning the condenser 6 for binary power generationaccording to the third embodiment further includes a control unit 43 inplace of the control unit 34 of the second embodiment. Otherconfigurations of the third embodiment are similar to the configurationsof the second embodiment and thus will be assigned with the samereference numbers as the second embodiment and will not be described.

The first thermometer 41 includes a first temperature sensor (not shown)for measuring the temperature of the cooling medium flowing from thefirst pipe 18 into the condenser 6. The first thermometer 41 is providedin the first pipe 18. The second thermometer 42 includes a secondtemperature sensor (not shown) for measuring the temperature of thecooling medium flowing out of the condenser 6. The second thermometer 42is provided in the second pipe 23. The temperatures measured by thefirst temperature sensor and the second temperature sensor are outputtherefrom as electric signals to the control unit 43.

When a temperature difference between the temperature measured by thefirst thermometer 41 and the temperature measured by the secondthermometer 42 has exceeded a predetermined value, the control unit 43controls the switching unit 33 to switch so that the flow of the coolingmedium is brought into the second state. Further, when a temperaturedifference between the temperature measured by the first thermometer 41and the temperature measured by the second thermometer 42 has reached avalue smaller than or equal to the predetermined value, the control unit43 controls the switching unit 33 to switch so that the flow of thecooling medium is brought into the first state. The predetermined valuecan be set accordingly in consideration of, for example, the specificheat of the cooling medium and the temperature of the working medium tobe heat-exchanged with the cooling medium and on the basis of atemperature difference assumed when the flow passage for the coolingmedium in the condenser 6 is actually blocked. For example, thepredetermined value can be set to a pressure difference generated whenthe temperature measured by the second thermometer 42 has become twiceas high as the temperature measured by the first thermometer 41.

FIG. 10 is a diagram illustrating the control operation of the controlunit 43 in the system X3 of cleaning the condenser 6 for binary powergeneration. When receiving the electric signals from the firsttemperature sensor and the second temperature sensor, the control unit43 subtracts the temperature value measured by the first temperaturesensor from the temperature measured by the second temperature sensor tocompute a temperature difference (step ST8). Other steps of the thirdembodiment are similar to the steps of the second embodiment and thuswill not be described.

According to the system X3 of cleaning the condenser 6 for binary powergeneration according to the third embodiment, when a temperaturedifference between the temperature measured by the first thermometer 41and the temperature measured by the second thermometer 42 has exceededthe predetermine value, the flow of the cooling medium is automaticallyswitched to the second state. Accordingly, foreign substances FS adheredto the periphery of the branch ports 11 are automatically separatedtherefrom; therefore, the foreign substances can be removed withoutdisassembling the condenser 6.

According to the system X3 of cleaning the condenser 6 for binary powergeneration according to the third embodiment, when a temperaturedifference between the temperature measured by the first thermometer 41and the temperature measured by the second thermometer 42 has reached avalue smaller than or equal to the predetermine value, the flow of thecooling medium is automatically switched to the first state.Accordingly, when the blocking of the flow passage for the coolingmedium in the condenser 6 is solved, an operator does not need toperform switching operation to the first state.

The system X3 of cleaning the condenser 6 for binary power generationaccording to the third embodiment includes the control unit 34.Alternatively, the system X3 may not include the control unit 34. Inthis case, an operator performs the switching operation from the firststate to the second state in the same way as in the case of the secondembodiment where the control unit 34 is not provided.

In the system X2 of cleaning the condenser 6 for binary power generationaccording to the second embodiment, the predetermined value is set onthe basis of a pressure difference, and in the system X3 of cleaning thecondenser 6 for binary power generation according to the thirdembedment, the predetermined value is set on the basis of a temperaturedifference. Alternatively, each of the predetermine values may be set onthe basis of a difference between flow rates. In this case, a firstflowmeter (not shown) for measuring the flow rate of the cooling mediumflowing from the first pipe 18 into the condenser 6 and a secondflowmeter (not shown) for measuring the flow rate of the cooling mediumflowing out of the condenser 6 are provided.

Fourth Embodiment

FIG. 11 is a schematic configuration diagram illustrating a system X4 ofcleaning the condenser 6 for binary power generation during normaloperation of the condenser 6. The system X4 of cleaning the condenser 6for binary power generation according to a fourth embodiment isdifferent from the system X1 according to the first embodiment in thatthree-way valves are applied as a switching unit 51 for reversing theflow direction of the cooling medium in the condenser 6. Otherconfigurations of the fourth embodiment are similar to theconfigurations of the first embodiment and thus will be assigned withthe same reference numbers as the first embodiment and will not bedescribed.

The switching unit 51 includes: a first three-way valve 51 a provided onthe first portion P1 in the first pipe 18; and a second three-way valve51 b provided on the fourth portion P4 in the second pipe 23. The firstthree-way valve 51 a is configured to open and close the flow passage ofthe first pipe 18 and to open and close the flow passage of the thirdpipe 24. The second three-way valve 51 b is configured to open and closethe flow passage of the second pipe 23 and to open and close the flowpassage of the fourth pipe 25.

The system X4 of cleaning the condenser 6 for binary power generationaccording to the fourth embodiment operates as follows. In order thatthe flow of the cooling medium is brought into the first state duringnormal operation, firstly, an operator opens the flow passage of thefirst pipe 18 of the first three-way valve 51 a and closes the flowpassage of the third pipe 24, and in addition, the operator opens theflow passage of the second pipe 23 of the second three-way valve 51 band closes the flow passage of the fourth pipe 25. Thus, the system X4of cleaning the condenser 6 for binary power generation according to thefourth embodiment is brought into the first state where the coolingmedium flows from the first pipe 18 into the condenser 6 and then flowsout to the second pipe 23.

FIG. 12 is a schematic configuration diagram illustrating the system X4of cleaning the condenser 6 for binary power generation. When apredetermined time has elapsed during normal operation, in order tobring the flow of the cooling medium into the second state, an operatorcloses the flow passage of the first pipe 18 of the first three-wayvalve 51 a and opens the flow passage of the third pipe 24, and inaddition, the operator closes the flow passage of the second pipe 23 ofthe second three-way valve 51 b and opens the flow passage of the fourthpipe 25. Thus, the system X4 of cleaning the condenser 6 for binarypower generation according to the fourth embodiment is brought into thesecond state where the cooling medium flows from the first pipe 18through the third pipe 24 and the second pipe 23 into the condenser 6.

The system X4 of cleaning the condenser 6 for binary power generationaccording to the fourth embodiment is configured to switch between thefirst state and the second state by two valves, that is, the firstthree-way valve 51 a and the second three-way valve 51 b; therefore, theswitching operation is easy compared to the foregoing first to thirdembodiments.

Fifth Embodiment

FIG. 13 is a schematic configuration diagram illustrating a method ofcleaning the condenser 6 for binary power generation during normaloperation of the condenser 6. The method of cleaning the condenser 6 forbinary power generation of a fifth embodiment is different from that ofthe first embodiment in that the third pipe 24 and the fourth pipe 25are not provided during normal operation. Furthermore, the method ofcleaning the condenser 6 for binary power generation according to thefifth embodiment is different from that of the first embodiment in thata switching unit 61 is provided in place of the switching unit 26 of thefirst embodiment. Other configurations of the fifth embodiment aresimilar to the configurations of the first embodiment and thus will beassigned with the same reference numbers as the first embodiment andwill not be described.

A cleaning system X5 used in the method of cleaning the condenser 6 forbinary power generation according to the fifth embodiment includes: afirst branched pipe 62 branched from the first pipe 18 and provided witha first joint 62 a at an end thereof; and a second branched pipe 63branched from the second pipe 23 and provided with a second joint 63 aat an end thereof. The cleaning system X5 used in the method of cleaningthe condenser 6 for binary power generation according to the fifthembodiment includes a third branched pipe 64 branched from the secondportion P2. The second portion P2 is located downstream, in the flowdirection of the cooling medium, of the first portion P1 of the firstpipe 18 on which the first branched pipe 62 is located. A third joint 64a is provided at an end of the third branched pipe 64. The cleaningsystem X5 used in the method of cleaning the condenser 6 for binarypower generation according to the fifth embodiment includes a fourthbranched pipe 65 branched from the fourth portion P4. The fourth portionP4 is located downstream, in the flow direction of the cooling medium,of the third portion P3 of the second pipe 23 on which the secondbranched pipe 63 is located. A fourth joint 65 a is provided at an endof the fourth branched pipe 65.

The switching unit 61 includes: a fifth on-off valve 61 a interposedbetween the first portion P1 and the second portion P2 of the first pipe18; and a sixth on-off valve 61 b interposed between the third portionP3 and the fourth portion P4 of the second pipe 23.

In the method of cleaning the condenser 6 for binary power generationaccording to the fifth embodiment, an operator opens the fifth on-offvalve 61 a and closes the sixth on-off valve 61 b so that the flow ofthe cooling medium is brought into the first state during normaloperation. Thus, the cleaning system X5 used in the method of cleaningthe condenser 6 for binary power generation according to the fifthembodiment is brought into the first state where the cooling mediumflows from the first pipe 18 into the condenser 6 and flows out to thesecond pipe 23. At this time, the first to fourth joints 62 a to 65 a ofthe first to fourth branched pipes 62 to 65 are closed; therefore, nocooling medium flows out of the first to fourth branched pipes 62 to 65.

FIG. 14 is a schematic configuration diagram illustrating the method ofcleaning the condenser 6 for binary power generation during cleaning ofthe condenser 6. When a predetermined time has elapsed during normaloperation, an operator performs the following first to fourth steps tobring the flow of the cooling medium into the second state.

Firstly, the operator stops a pump (not shown) provided upstream in thefirst pipe 18 to stop the flow of the cooling medium. Next, the operatorperforms the first step of connecting the first branched pipe 62 throughthe third pipe 24 to the second branched pipe 63 via the first joint 62a and via the second joint 63 a. After the first step, the operatorperforms the second step of connecting the third branched pipe 64through the fourth pipe 25 to the fourth branched pipe 65 via the thirdjoint 64 a and via the fourth joint 65 a. After the second step, theoperator performs the third step of closing the fifth on-off valve 61 aand the sixth on-off valve 61 b. Finally, the operator activates thepump (not shown) provided upstream in the first pipe 18 to flow thecooling medium.

Accordingly, the flow of the cooling medium is stopped between the firstportion P1 and the second portion P2 of the first pipe 18 and betweenthe third portion P3 and the fourth portion P4 of the second pipe 23.Therefore, the cooling medium flows through the first pipe 18, the firstbranched pipe 62, the third pipe 24, the second branched pipe 63, thesecond pipe 23, the condenser 6, the first pipe 18, the third branchedpipe 64, the fourth pipe 25, the fourth branched pipe 65, and the secondpipe 23 in the mentioned order. Thus, the flow of the cooling medium isswitched to the second state; therefore, cleaning of the condenser 6 isperformed.

After a predetermined time has elapsed during cleaning of the condenser,in order to switch the flow of the cooling medium to the first state,the operator stops the pump (not shown) provided upstream in the firstpipe 18 to stop the flow of the cooling medium. Thereafter, the operatorremoves the third pipe 24 and the fourth pipe 25 and closes the first tofourth joints 62 a to 65 a. Finally, the operator activates the pump(not shown) provided upstream in the first pipe 18 to flow the coolingmedium. Thus, the operator switches the flow of the cooling medium fromthe second state to the first state.

According to the method of cleaning the condenser 6 for binary powergeneration of the fifth embodiment, the first to third steps areperformed; thereby, the flow of the cooling medium can be switched to adirection from the heat exchanger 6 a to the inlet header 6 b.Accordingly, the force in a direction to separate foreign substancesfrom the branch ports 11 can be applied to the foreign substancesadhered to the periphery of the branch ports 11. Therefore, the foreignsubstances adhered to the periphery of the branch ports 11 are easilyseparated therefrom. Consequently, the foreign substances can be removedwithout disassembling the condenser 6.

According to the method of cleaning the condenser 6 for binary powergeneration of the fifth embodiment, as long as the blocking of the flowpassage for the cooling medium in the condenser 6 does not occur, theoperator may not have to perform the first step to the third step.Therefore, the method of cleaning the condenser 6 for binary powergeneration of the fifth embodiment can reduce installation costs.

According to the method of cleaning the condenser 6 for binary powergeneration of the fifth embodiment, respective on-off valves (not shown)for opening and closing the flow passage for the cooling medium may beprovided in the first to fourth branched pipes 62 to 65. Therefore, in astate where the on-off valves are closed, an operator can connect thethird pipe 24 to the first branched pipe 62 and the second branched pipe63 without stopping the flow of the cooling medium. Likewise, theoperator can connect the fourth pipe 25 to the third branched pipe 64and the fourth branched pipe 65 without stopping the flow of the coolingmedium.

In the foregoing embodiments, the strainer 27 for removing the foreignsubstances FS in the cooling medium from the cooling medium is providedin the fourth pipe 25. Alternatively, the strainer 27 may not beprovided. In this case, the foreign substances FS in the cooling mediumare released together with the cooling medium into the sea or the river.Therefore, marine organisms adhered to the inside of the condenser 6will be returned into the sea or the like, which is environmentallyfriendly.

What is claimed is:
 1. A system of cleaning a condenser for binary powergeneration, the condenser being provided in a circulation flow passagefor allowing circulation of a working medium in a binary powergeneration system, wherein the condenser comprises: an inlet header intowhich a cooling medium flows; and a heat exchanger including a pluralityof branch ports into which the cooling medium flows from the inletheader, the heat exchanger being configured to perform heat exchangebetween the working medium and the cooling medium to condense theworking medium, and the cleaning system comprises a switching unitconfigured to switch a flow of the cooling medium to a direction fromthe heat exchanger to the inlet header.
 2. The system of cleaning thecondenser for binary power generation according to claim 1, comprising:a third pipe adapted to connect a first pipe for allowing the coolingmedium to flow into the inlet header of the condenser, to a second pipefor allowing the cooling medium to flow out of the condenser; and afourth pipe adapted to connect a second portion of the first pipe to afourth portion of the second pipe, the second portion being locateddownward, in a flow direction of the cooling medium, of a first portionof the first pipe to which the third pipe is connected, the fourthportion being located downstream, in the flow direction of the coolingmedium, of a third portion of the second pipe to which the third pipe isconnected, wherein the switching unit switches from a first state wherethe cooling medium flows from the first pipe into the condenser to asecond state where the cooling medium flows from the first pipe throughthe third pipe and the second pipe into the condenser.
 3. The system ofcleaning the condenser for binary power generation according to claim 2,comprising a strainer provided in the fourth pipe and configured toremove foreign substances in the cooling medium from the cooling medium.4. The system of cleaning the condenser for binary power generationaccording to claim 2, comprising: a first pressure meter provided in thefirst pipe and configured to measure a pressure of the cooling mediumflowing from the first pipe into the condenser; and a second pressuremeter provided in the second pipe and configured to measure a pressureof the cooling medium flowing out of the condenser.
 5. The system ofcleaning the condenser for binary power generation according to claim 4,comprising a control unit configured to, when a difference between apressure value measured by the first pressure meter and a pressure valuemeasured by the second pressure meter has exceeded a predeterminedvalue, control the switching unit to establish the second state.
 6. Thesystem of cleaning the condenser for binary power generation accordingto claim 5, wherein the control unit is configured to, when a differencebetween a pressure value measured by the first pressure meter and apressure value measured by the second pressure meter has reached a valuesmaller than or equal to the predetermined value, control the switchmeans to establish the first state.
 7. The system of cleaning thecondenser for binary power generation according to claim 2, comprising:a first thermometer provided in the first pipe and configured to measurea temperature of the cooling medium flowing from the first pipe into thecondenser; and a second thermometer provided in the second pipe andconfigured to measure a temperature of the cooling medium flowing out ofthe condenser.
 8. The system of cleaning the condenser for binary powergeneration according to claim 7, comprising a control unit configuredto, when a temperature difference between a temperature measured by thefirst thermometer and a temperature measured by the second thermometerhas exceeded a predetermined value, control the switching unit toestablish the second state.
 9. The system for the condenser for binarypower generation according to claim 8, wherein the control unit isconfigured to, when a temperature difference between a temperaturemeasured by the first thermometer and a temperature measured by thesecond thermometer has reached a value smaller than or equal to thepredetermined value, control the switching unit to establish the firststate.
 10. A method of cleaning a condenser for binary power generation,the condenser being provided in a circulation flow passage for allowingcirculation of a working medium in a binary power generation system,wherein the condenser comprises: an inlet header into which a coolingmedium flows; and a heat exchanger including a plurality of branch portsinto which the cooling medium flows from the inlet header, the heatexchanger being configured to perform heat exchange between the workingmedium and the cooling medium to condense the working medium, and thecleaning method comprises the step of switching a flow of the coolingmedium to a direction from the heat exchanger to the inlet header. 11.The method of cleaning the condenser for binary power generationaccording to claim 10, comprising: a first branched pipe branched from afirst pipe for allowing the cooling medium to flow into the inlet headerof the condenser, the first branched pipe including a first joint at anend thereof; a second branched pipe branched from a second pipe forallowing the cooing medium to flow out of the condenser, the secondbranched pipe including a second joint at an end thereof; a thirdbranched pipe branched from a second portion of the first pipe, which islocated downstream, in a flow direction of the cooling medium, of afirst portion of the first pipe from which the first branched pipe isbranched, the third branched pipe including a third joint at an endthereof; a fourth branched pipe branched from a fourth portion of thesecond pipe, which is located downstream, in the flow direction of thecooling medium, of a third portion of the second pipe from which thesecond branched pipe is branched, the fourth branched pipe including afourth joint at an end thereof; and a switching unit configured to stopthe flow of the cooling medium between the first portion and the secondportion of the first pipe and to stop the flow of the cooling mediumbetween the third portion and the fourth portion of the second pipe,wherein the method comprises: a first step of connecting the firstbranched pipe through the third pipe to the second branched pipe via thefirst joint and via the second joint; a second step of connecting thethird branched pipe through the fourth pipe to the fourth branched pipevia the third joint and via the fourth joint; and a third step ofswitching by the switching unit from a first state where the coolingmedium flows from the first pipe into the condenser to a second statewhere the cooling medium flows from the first pipe through the thirdpipe and the second pipe into the condenser.
 12. The system of cleaningthe condenser for binary power generation according to claim 3,comprising: a first pressure meter provided in the first pipe andconfigured to measure a pressure of the cooling medium flowing from thefirst pipe into the condenser; and a second pressure meter provided inthe second pipe and configured to measure a pressure of the coolingmedium flowing out of the condenser.
 13. The system of cleaning thecondenser for binary power generation according to claim 3, comprising:a first thermometer provided in the first pipe and configured to measurea temperature of the cooling medium flowing from the first pipe into thecondenser; and a second thermometer provided in the second pipe andconfigured to measure a temperature of the cooling medium flowing out ofthe condenser.